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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



Fixed points of Anosov maps of certain manifolds

Author: Jonathan D. Sondow
Journal: Proc. Amer. Math. Soc. 61 (1976), 381-384
MSC: Primary 58F15; Secondary 55C20
MathSciNet review: 0438398
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Abstract: Lemma. If $ H$ is a graded exterior algebra on odd generators with augmentation ideal $ J$ and $ h:H \to H$ is an algebra homomorphism inducing $ J/{J^2} \to J/{J^2}$ with eigenvalues $ \{ {\lambda _i}\} $, then the Lefschetz number $ L(h) = \Pi (1 - {\lambda _i})$. The lemma is applied to an Anosov map or diffeomorphism of a compact manifold with real cohomology $ H$ to give sufficient conditions that none of the eigenvalues $ {\lambda _i}$ be a root of unity and that there exist a fixed point. In particular, every Anosov diffeomorphism of a compact connected Lie group has a fixed point.

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Keywords: Anosov diffeomorphism, periodic point, exterior algebra, Lie group, Lefschetz number, eigenvalue, root of unity
Article copyright: © Copyright 1976 American Mathematical Society